Centrifugal pump with novel intermediate structure

Abstract

The utility model provides a centrifugal pump with a novel intermediate structure, and belongs to the technical field of water pumps. The problems that in the prior art, an intermediate is not high in structural strength and poor in sealing performance are solved. The water pump comprises a pump base, a pump shaft, a pump shell, a middle body, a bracket and a water pump motor, the middle body is fixedly installed between the pump shell and the bracket, a plurality of connecting blocks are formed on the periphery of the middle body, a coupling barrel is formed in the middle body, the interior of the coupling barrel is of a through structure, and the pump shaft penetrates through the interior of the coupling barrel. A mounting cylinder is formed in the middle body on the outer side of the coupling cylinder, a mounting sealing cavity is formed between the coupling cylinder and the mounting cylinder, a mechanical sealing device is mounted in the mounting sealing cavity, the mechanical sealing device is completely attached to the outer side end face of the mounting sealing cavity, and the mechanical sealing device is fixed to the inner side end face of the mounting sealing cavity. The utility model has the advantages that the intermediate body is high in structural strength and good in sealing performance.

Description

Technical Field

[0001] This utility model belongs to the field of water pump technology and relates to a centrifugal pump with a novel intermediate structure. Background Technology

[0002] A centrifugal pump is a rotary power pump that uses a rotating impeller to generate centrifugal force to transport fluids. It is widely used in process engineering and has the advantages of simple structure, large and uniform flow rate, and convenient operation. It is suitable for transporting liquids with special properties such as corrosiveness and suspension.

[0003] Chinese patent publication number CN209908771U discloses a multi-stage centrifugal pump, comprising a first pump body, a second pump body, an intermediate body, an external connecting pipe, and a power shaft. The first and second pump bodies have identical structures and are symmetrically arranged. At least two stages of impellers are arranged along the axis inside the first pump body, and the power shaft passes through the impeller axes inside both pump bodies. The impellers inside the first and second pump bodies are fitted with the power shaft. A hollow intermediate body, communicating with both pump bodies, is located between them. An outlet communicating with the internal cavity is provided on the side wall of the intermediate body, and an inlet communicating with the internal cavity is provided on the outer side wall of both pump bodies.

[0004] The patent provides a multi-stage centrifugal pump in which the intermediate body is hollow inside and only has through holes on both sides. It does not have an effective reinforcing structure and relies only on simple component bonding and connection structure, which makes it difficult to guarantee long-term efficient sealing and structural stability. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a centrifugal pump with a novel intermediate structure.

[0006] The objective of this utility model can be achieved through the following technical solution: A novel centrifugal pump with an intermediate body structure includes a pump base, a pump shaft, a pump housing, an intermediate body, a bracket, and a water pump motor. The pump housing, intermediate body, bracket, and water pump motor are all fixedly installed on the upper end of the pump base. The intermediate body is fixedly installed between the pump housing and the bracket. Several connecting blocks are formed on the outer periphery of the intermediate body. A coupling cylinder is formed inside the intermediate body. The coupling cylinder has a through structure, and the pump shaft passes through the inside of the coupling cylinder. An installation cylinder is formed in the intermediate body outside the coupling cylinder. An installation sealing cavity is formed between the coupling cylinder and the installation cylinder. A mechanical seal device is installed inside the installation sealing cavity. The mechanical seal device is completely fitted with the outer end face of the installation sealing cavity and is fixed to the inner end face of the installation sealing cavity. The horizontal length of the mechanical seal device is less than the horizontal length of the installation sealing cavity. A sealing cover is fitted and fixed on the pump shaft on one side of the intermediate body. One end of the sealing cover is cylindrical and extends into the installation sealing cavity. The other end of the sealing cover is fitted and fixed to the outer end face of the installation cylinder.

[0007] In the centrifugal pump with the above-mentioned novel intermediate structure, a plurality of connecting plates are formed on one side of the bracket, and two first connecting holes are opened in the connecting plates. A second connecting hole is opened in the connecting block. The first connecting hole and the second connecting hole are in the same position and connected when the intermediate body and the bracket are connected. A first fastening bolt is inserted and fixed in the first connecting hole and the second connecting hole.

[0008] In the centrifugal pump with the above-mentioned novel intermediate body structure, a connecting groove is provided in the intermediate body on the outer periphery of the mounting cylinder, a connecting step is formed in the connecting groove, and a connecting protrusion is formed on one side of the bracket. The connecting step and the connecting protrusion fit and fix together when the intermediate body and the bracket are connected.

[0009] In the centrifugal pump with the above-mentioned novel intermediate structure, an installation reinforcing block is formed in the intermediate body outside the mounting cylinder, a third connecting hole is provided in the installation reinforcing block, and a fourth connecting hole is provided in the sealing gland. The third connecting hole and the fourth connecting hole are located at the same horizontal position when the intermediate body and the sealing gland are connected, and a second fastening bolt is passed through and fixed in the third connecting hole and the fourth connecting hole.

[0010] Compared with the prior art, the centrifugal pump with a novel intermediate structure provided by this utility model has the following beneficial effects: 1. The installation sealing cavity formed between the coupling cylinder and the mounting cylinder provides a dedicated installation space for the mechanical seal device. The mechanical seal device is completely fitted to the outer end face of the installation sealing cavity and fixed to the inner end face, and its horizontal length is less than the horizontal length of the installation sealing cavity. This design allows the mechanical seal device to have a certain amount of movement and buffer space within the installation cavity, effectively preventing media leakage and improving the sealing performance of the centrifugal pump. One end of the sealing gland, a cylindrical part, extends into the installation sealing cavity, and the other end is fitted and fixed to the outer end face of the mounting cylinder. The sealing gland not only further strengthens the fixation and protection of the mechanical seal device, but also prevents... 1. It prevents external impurities from entering the installation sealing cavity, providing double protection for the mechanical seal device; 2. The first connecting hole on the connecting plate on one side of the bracket and the second connecting hole on the intermediate body connecting block are in the same position and connected when the intermediate body and the bracket are connected, and are fixed by the first fastening bolt. The connection method of multiple sets of holes and bolts increases the stability of the connection between the intermediate body and the bracket. The connecting step in the connecting groove of the intermediate body on the outer periphery of the mounting cylinder and the connecting protrusion on one side of the bracket fit together and are fixed when connected. This concave-convex fit structure design further enhances the connection accuracy and stability between the intermediate body and the bracket. The tight fit between the connecting step and the connecting protrusion can effectively limit the relative displacement between the intermediate body and the bracket, and improve the overall reliability of the equipment. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the exploded structure at the intermediate body and bracket.

[0013] Figure 3 This is a schematic diagram of the intermediate structure.

[0014] In the diagram: 1. Pump base; 2. Pump shaft; 3. Pump housing; 4. Intermediate body; 41. Connecting block; 411. Second connecting hole; 42. Coupling cylinder; 43. Mounting cylinder; 44. Mounting sealing cavity; 45. Connecting groove; 46. Connecting step; 47. Mounting reinforcing block; 471. Third connecting hole; 5. Bracket; 51. Connecting plate; 511. First connecting hole; 52. Connecting protrusion; 6. Pump motor; 7. Mechanical seal device; 8. Sealing gland; 81. Fourth connecting hole; 9. First fastening bolt; 10. Second fastening bolt. Detailed Implementation

[0015] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0016] like Figure 1 As shown, this embodiment includes a pump base 1, a pump shaft 2, a pump housing 3, an intermediate body 4, a bracket 5, and a water pump motor 6. The pump housing 3, the intermediate body 4, the bracket 5, and the water pump motor 6 are all fixed to the upper end of the pump base 1 by bolts or other fixing methods to ensure the overall structure is stable.

[0017] like Figures 1 to 3 As shown, the intermediate body 4 is fixedly installed between the pump housing 3 and the bracket 5. Eight connecting blocks 41 are formed on the outer periphery of the intermediate body 4 in a circular array. A coupling cylinder 42 is provided inside the intermediate body 4 and is internally connected. The pump shaft 2 passes through the inside of the coupling cylinder 42 to ensure the rotation of the pump shaft 2. An installation cylinder 43 is provided on the outer side of the intermediate body 4. An installation sealing cavity 44 is formed between the coupling cylinder 42 and the installation cylinder 43. The mechanical seal device 7 is installed in the installation sealing cavity 44. The mechanical seal device 7 is completely fitted with the outer peripheral end face of the installation sealing cavity 44 and fixed with the inner end face of the installation sealing cavity 44. Specifically, the horizontal length of the mechanical seal device 7 is less than the horizontal length of the installation sealing cavity 44. A sealing cover 8 is fitted on one side of the pump shaft 2 of the intermediate body 4. One end of the sealing cover 8 is cylindrical and extends into the installation sealing cavity 44. The other end is fitted and fixed with the outer end face of the installation cylinder 43 to strengthen the protection and fixation of the mechanical seal device 7.

[0018] To elaborate further, such as Figures 1 to 3 As shown, the bracket 5 has four connecting plates 51 on the side near the intermediate body 4. The connecting plates 51 have two first connecting holes 511. Each connecting block 41 has a second connecting hole 411. When the intermediate body 4 and the bracket 5 are connected, every two connecting blocks 41 are attached to a connecting plate 51. The first connecting holes 511 and the second connecting holes 411 are in the same position and are connected. The first fastening bolt 9 passes through the first connecting holes 511 and the second connecting holes 411 to fix the intermediate body 4 and the bracket 5.

[0019] To elaborate further, such as Figures 1 to 3 As shown, a connecting groove 45 is provided in the intermediate body 4 on the outer periphery of the mounting cylinder 43, and a connecting step 46 is formed in the connecting groove 45. A connecting protrusion 52 is formed on one side of the bracket 5. The connecting step 46 and the connecting protrusion 52 fit together and are fixed when the intermediate body 4 and the bracket 5 are connected, which enhances the connection accuracy and stability and limits the relative displacement.

[0020] To elaborate further, such as Figures 1 to 2As shown, an installation reinforcing block 47 is formed in the intermediate body 4 outside the mounting cylinder 43. A third connecting hole 471 is provided in the installation reinforcing block 47, and a fourth connecting hole 81 is provided in the sealing cover 8. The third connecting hole 471 and the fourth connecting hole 81 are located at the same horizontal position when the intermediate body 4 and the sealing cover 8 are connected. The second fastening bolt 10 passes through the third connecting hole 471 and the fourth connecting hole 81 and fixes the sealing cover 8 and the intermediate body 4.

[0021] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0022] Although this document uses a variety of terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. A novel centrifugal pump with an intermediate structure, comprising a pump base (1), a pump shaft (2), a pump housing (3), an intermediate body (4), a bracket (5), and a water pump motor (6), wherein the pump housing (3), the intermediate body (4), the bracket (5), and the water pump motor (6) are all fixedly installed on the upper end of the pump base (1), and the intermediate body (4) is fixedly installed between the pump housing (3) and the bracket (5), characterized in that: The intermediate body (4) has several connecting blocks (41) formed on its outer periphery. A coupling cylinder (42) is formed inside the intermediate body (4). The coupling cylinder (42) has a through structure and the pump shaft (2) passes through the inside of the coupling cylinder (42). An mounting cylinder (43) is formed in the intermediate body (4) outside the coupling cylinder (42). An installation sealing cavity (44) is formed between the coupling cylinder (42) and the installation cylinder (43). A mechanical seal device (7) is installed inside the installation sealing cavity (44). The device (7) is completely fitted to the outer end face of the installation sealing cavity (44) and the mechanical seal device (7) is fixed to the inner end face of the installation sealing cavity (44). The horizontal length of the mechanical seal device (7) is less than the horizontal length of the installation sealing cavity (44). A sealing cover (8) is fitted and fixed on the pump shaft (2) on one side of the intermediate body (4). One end of the sealing cover (8) is cylindrical and extends into the installation sealing cavity (44). The other end of the sealing cover (8) is fitted and fixed to the outer end face of the installation cylinder (43).

2. The centrifugal pump with a novel intermediate structure according to claim 1, characterized in that: A plurality of connecting plates (51) are formed on one side of the bracket (5). Two first connecting holes (511) are provided in the connecting plates (51), and a second connecting hole (411) is provided in the connecting block (41). The first connecting hole (511) and the second connecting hole (411) are in the same position and connected when the intermediate body (4) and the bracket (5) are connected. A first fastening bolt (9) is inserted and fixed in the first connecting hole (511) and the second connecting hole (411).

3. The centrifugal pump with a novel intermediate structure according to claim 1, characterized in that: A connecting groove (45) is provided in the intermediate body (4) on the outer periphery of the mounting cylinder (43), a connecting step (46) is formed in the connecting groove (45), and a connecting protrusion (52) is formed on one side of the bracket (5). The connecting step (46) and the connecting protrusion (52) fit together and are fixed when the intermediate body (4) and the bracket (5) are connected.

4. A centrifugal pump with a novel intermediate structure according to claim 1, characterized in that: An installation reinforcing block (47) is formed in the intermediate body (4) outside the mounting cylinder (43). A third connecting hole (471) is provided in the installation reinforcing block (47), and a fourth connecting hole (81) is provided in the sealing cap (8). The third connecting hole (471) and the fourth connecting hole (81) are located at the same horizontal position when the intermediate body (4) and the sealing cap (8) are connected, and a second fastening bolt (10) is inserted and fixed in the third connecting hole (471) and the fourth connecting hole (81).

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